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healthz-proxy

healthz-proxy is a small Go program that will proxy /healthz requests to a configured upstream, and is intended to be used as a sidecar to a pod.

When it receives SIGINT or SIGTERM it will stop proxying requests and respond with 503 for a configurable time period. This can be useful if one is running for example nginx-ingress controller as a DaemonSet with a load balancer provisioned via other means (e.g. Terraform) than through Kubernetes, and want to achieve zero downtime rollouts.

Usage

$ healthz-proxy -help
Usage of healthz-proxy:
  -fail-period duration
        time to fail health checks for before stopping server (default 30s)
  -listen-addr string
        server listen address (default ":8080")
  -proxy-url string
        URL to proxy to (default "http://:8081/healthz")
  -shutdown-timeout duration
        time to wait for server to stop gracefully (default 5s)

License

MIT